International Journal of Power Electronics (Int J Power Electron )

Publisher: Inderscience

Description

IJPElec is a refereed international journal which presents to the international scientific community important results of work in this field, whether in the form of modelling, simulation, analysis, fundamental research, development, application, design or real-time implementation. The scope of IJPElec is broad, encompassing all aspects of power electronics.

Publisher details

Inderscience

  • Pre-print
    • Author cannot archive a pre-print version
  • Post-print
    • Author cannot archive a post-print version
  • Restrictions
    • 6 months embargo
  • Conditions
    • Cannot archive until publication
    • On author's website or institutional repository
    • On subject repository if required by funder
    • Publisher copyright and source must be acknowledged
    • Must link to journal webpage and /or DOI
    • Publisher's version/PDF cannot be used
  • Classification
    ​ white

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: A robust torque, flux and speed controllers design method for Permanent Magnet Synchronous Motor (PMSM) drive is introduced in this paper. A simple algorithm is illustrated to adjust the parameters of torque, flux and speed controllers. This mini-max optimisation problem is solved using Particle Swarm Optimisation Approach (PSO). The solution thus attained is global optimal and robust. The proposed technique discards common problems in conventional Direct Torque Control (DTC) including; torque ripples, resistance change effect, low speed and integration drift. Also it is represented by fast tracking capability, deadbeat responses, and robust to load disturbances and low speed operation. Simulation and experimental results verify the expediency and viability of the proposed technique.
    International Journal of Power Electronics 01/2013; 5(5/6):301-321.
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    ABSTRACT: This paper presents a hybrid active power filter for harmonics and reactive current compensation while reducing the rating of active power filter. The proposed topology of hybrid active power filter uses the combination of active power filter and a new self-tuned passive filter. The control technique of the proposed system separates the compensation frequency band for active and passive filters. The self-tuned passive filters are tuned to suppress two lower most harmonic components, i.e., fifth and seventh and the active power filter compensates the remaining higher order harmonics. The active power filter control is based on reference current estimation in a-b-c frame. An analytical study of thyristor controlled reactor (TCR)-based self-tuned passive filters is presented to keep the passive filters in the resonant state during deviation of their parameters under the influence of external factors like temperature rise, aging, etc. The firing angle of the TCR is derived as a function of the deviation of passive filter parameters. The proposed hybrid active power filter is also capable to damp out the harmonics propagation due to passive filter resonance. The proposed algorithm is simulated in MATLAB/Simulink environment under various operation conditions to show the effectiveness of the controller.
    International Journal of Power Electronics 05/2012;
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    ABSTRACT: This paper presents a harmonics extraction algorithm using artificial neural network methods. The neural network algorithm was used due to the simpler calculation process compared with conventional method such as fast Fourier transform (FFT). Two types of neural network, i.e., multi-layer perceptron (MLP) and radial basis function (RBF) were employed to extract harmonics current component from its distorted wave current. Further, the extracted harmonics current was used as reference current for shunt active power filter (APF) control. This paper compared the performance of MLP and RBF for harmonics extraction. The advantages of RBF are simpler shape of the network and faster learning speed. Unfortunately, the RBF need to be trained recursively for various harmonics component. MLP can be used to extract various harmonics component in specific data range but need large number of data training hence slower training process.
    International Journal of Power Electronics 05/2012;
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    ABSTRACT: The paper introduces a design technique for robust PID controllers for inductance capacitance inductance-T network (LCL-T) series parallel resonant converts. AC analysis and stability analysis for LCL-T series parallel converter are premeditated. The converter controllers’ designs are based on bacterial foraging optimisation (BFO). A BFO algorithm is utilised in order to obtain the controller parameters and guarantee superior step response performance criterion. Simulation results of the designed controllers are compared with that of conventional controllers whose parameters are tuned by using will known Ziegler-Nichols technique. Results imply the perfection of the proposed technique over the conventional method. Experimental measurements of system performance validate the proposed technique and emphasise its feasibility.
    International Journal of Power Electronics 01/2012; 4(5):497-504.
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    ABSTRACT: This paper presents the analysis, design and voltage regulation of a zero voltage switching quasi resonant-negative output voltage lift Luo converter with low switching losses for aerospace applications. To increase the power packing density, a simple control method using an analogue resonant controller UC3861 is used to regulate the output voltage against load variation and supply disturbance. The performance of the controller is verified by developing a prototype model of the converter and experimental results are presented. The results reveal the superiority of using a single dedicated IC for voltage regulation. Also, it is observed that the converter provides maximum efficiency of 96% at full load.
    International Journal of Power Electronics 08/2011; 3(5):547-560.
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    ABSTRACT: A novel electronic igniter for HID lamps has been investigated in this paper. The new designed appliance has many good performances such as substantially less volume and weight compared with the traditional magnetic igniter. The main contributions are as follows: 1) a new configuration of the new device and its operational principle have been explained and described; 2) the model of the igniter has been put forward to analyse the electric properties, and the more important design considerations, which should be taken in account, has been developed when a practical igniter are designed; 3) a prototype for 5,75W HID lamp has been built. The proposed theory and approaches have been verified by the results of the experiments and computer simulation. The experimental results show that the volume and weight of the prototype has reduced by at least 80% than of the magnetic igniter.
    International Journal of Power Electronics 04/2011;
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    ABSTRACT: This paper deals with a wind energy conversion system (WECS), based on a doubly fed induction generator (DFIG) and an electromechanical active power filter (APF). The objective is to respond simultaneously to electric energy requirement and power quality concerns. The proposed WECS is able not only to track the maximum power point of the wind energy but also to dampen harmonic currents from the grid line. To achieve these purposes, back‐to‐back pulse width modulation (PWM) voltage source converters (VSCs) are employed to excite the DFIG rotor. To control the power converters, two regulation loops, following the field oriented control (FOC) method, have been conceived. The first loop, dedicated to the rotor converter, enables a decoupled control of active and reactive powers flows. As well, it permits the cancellation of the most noteworthy harmonics from the utility current. The second loop, devoted to the front‐end converter (FEC), makes it possible to regulate the DC‐bus voltage shared between the two converters. Furthermore, the paper provides a study of the DFIG sub and super‐synchronous operating modes which can be reached by acting on the wind speed. To demonstrate the performance of aforementioned WECS, a Matlab/Simulink model was established and simulated. Results seem to be very promising.
    International Journal of Power Electronics 03/2011;
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    ABSTRACT: An adaptive position tracking control scheme for induction motors is proposed subject to unknown load torque via adaptive backstepping design. An observer derived from the dynamical model is also given to provide the information of rotor flux angle which decides the proportion of input voltage in d‐q frame. Besides, the controller is developed under a special non‐linear coordinate transform such that position control objective can be fulfilled with backstepping approach. The underlying design concept is to endow the closed‐loop system while lacking the knowledge of some mechanical system parameters, such as the motor inertia motor damping coefficient, and the unknown payload. The proposed control scheme comes along with a thorough proof based on Lyapunov stability theory. PC‐based experimental results are also given to validate the effectiveness of the proposed control scheme.
    International Journal of Power Electronics 01/2011; 3(2).
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    ABSTRACT: This paper presents the design and practical implementation of a digital current controller for a three‐phase PWM voltage source inverter connected to the grid via an LCL filter to produce a high quality current injected into the grid. A two‐feedback loops control system is proposed, with an outer grid current loop and an inner filter capacitor current loop. The controller also incorporates a grid voltage feedforward loop to compensate for the effect of the utility voltage disturbance. The paper also discusses the effect of the sampling and computational time delay both on system stability and current quality. This time delay is shown to reduce the stability of the inner loop. However, it is also shown that it is better, from the point of view of output current THD quality, to increase the inner loop time delay to a full one sampling period, so that the mains frequency envelope (nearly ripple free) current component is sampled at the peaks and troughs of the PWM, away from the switching instances of the transistors and associated switching noise. To ensure system stability, a capacitor current observer is proposed to compensate for the computational time delay. The design of the capacitor current observer and the controller are discussed. Simulation and practical results are presented to validate the design.
    International Journal of Power Electronics 01/2011; 3(3).
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    ABSTRACT: This paper investigated the losses and thermal characteristics of induction motors operated from pulse width-modulated (PWM) voltage supply in comparison to that operated from sinusoidal voltage supply. It was concluded that due to the abundant harmonics in the PWM waveforms, significant losses are induced in the motor by the inverter supply. The temperature ascends correspondingly. Switching frequencies of the PWM inverter at 3.5 kHz to 9 kHz were investigated to evaluate their effect on the excessive losses. Experiments were conducted with no load and with load conditions. The losses and thermal characteristics were calculated using finite-element analysis (FEA) and validated by the experiments.
    International Journal of Power Electronics 01/2011; 3(6):641-651.
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    ABSTRACT: This paper proposes distribution static compensator topologies for application in three‐phase high power distribution systems. These topologies overcome both the voltage and current rating constraints imposed by the semiconductor switches by the use of three single‐phase multi‐secondary transformers. Five topologies, namely, four leg‐group, three leg‐group split‐capacitor, H bridge‐group, three leg‐group and two leg‐group are suggested. These can effectively compensate unbalance, harmonics and low power factor of the load currents. Apart from the use of minimum number of current sensors and a single capacitor, the control circuit is very simple. It provides the electrical isolation and security deemed essential for high voltage systems. A detailed comparison is made for these topologies. Based on the hardware requirement and compensation quality, the four leg‐group and three leg‐group topologies are shown to be superior than the other structures for application in three phase four‐wire and three‐wire systems respectively. They are validated through extensive simulation studies using PSCAD in a three‐phase four‐wire power network with non‐linear unbalanced load. Experimental verification is conducted for H bridge‐group topology on a single phase system using a DSP‐based prototype laboratory model.
    International Journal of Power Electronics 01/2010; 2(2).
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    ABSTRACT: This paper presents accurate particle swarm optimisation based‐solutions for non‐linear transcendental equations of selective harmonic elimination technique used in single‐phase PWM inverters. The proposed method computes efficiently the required switching angles to eliminate low order harmonics up to the 15th from the inverter voltage waveform while maintaining the amplitude of the fundamental harmonic at the desired value. The proposed PSO‐based method is studied and tested for two possible switching patterns: unipolar and bipolar PWM. In both patterns, the minimisation method of selected objective function and evaluation of the method are presented. The results prove that the proposed method converges to the solution after a few number of iterations compared with other algorithms such as genetic algorithms and ant colony. The main contribution of the paper lies in the application of PSO algorithm to eliminate any desired number of harmonics. Moreover, the method is also applicable to three‐phase voltage source inverters.
    International Journal of Power Electronics 01/2010; 2(2).
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    ABSTRACT: This paper brings out an improved control strategy for an inverter employed to integrate a 3‐kW wind‐driven permanent‐magnet synchronous generator (PMSG) to the utility network. The proposed controller features a feed‐back control for enhanced current tracking performance and a feed‐forward control for power tracking with varying wind‐speeds. The harmonic content of the current fed to the grid is minimised by a hybrid feed‐back controller comprising PI and hysteresis blocks in cascade. The feed‐back current controller derives a varying current reference with varying wind‐speed from the feed‐forward control loop. This paper brings out the ability of the controller to vary the amplitude of the inverter‐current with varying wind‐speed, without distorting the inverter current waveform. Simulation results of a wind‐driven PMSG integrated to a single‐phase grid using an inverter with the proposed control is presented. Waveform obtained from an experimental test‐rig is also given.
    International Journal of Power Electronics 01/2010; 2(2).
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    ABSTRACT: This paper presents an area efficient single chip field programmable gate array (FPGA) implementation for space vector pulse width modulator (SVPWM) using Q‐format data representation. This new methodology in VLSI signal processing for SVPWM results in less chip resources utilisation and improved accuracy in all internal modules of the controller. The control algorithm has been developed using a very high speed integrated circuit hardware description language (VHDL) and FPGA, which provides great flexibility and technological independence. The theoretical analysis of Q‐format with an example is carried out and the result shows that Q‐format implementation occupies less resources and improved output accuracy of the IC compared to integer fixed point representation. The proposed Q‐format representation for SVPWM is verified with simulation and experiments and the result shows the feasibility of practical implementation in real time for three phase inverter fed induction motor drive.
    International Journal of Power Electronics 01/2010; 2(2).
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    ABSTRACT: Based on the technology of field programmable gate array (FPGA), a realization of fuzzy control (FC) system with radial basis function neural network (RBF NN) tuning is presented to a permanent linear synchronous motor (PMLSM) drive in this paper. Firstly, a mathematic model of the PMLSM drive is defined; then to increase the performance of the PMLSM drive system, an FC constructed by a fuzzy basis function and its parameter adjustable mechanism using RBF NN is applied to the position control loop of the PMLSM drive system to cope with the effect of the system dynamic uncertainty and the external load. Secondly, FPGA by using finite state machine (FSM) method is presented to realize the aforementioned controllers, and VHSIC hardware description language (VHDL) is adopted to describe the circuit of the FSM. Finally, an experimental system is established to verify the effectiveness of the proposed FPGA-based neural fuzzy control system for PMLSM, and some experimental results are confirmed theoretically.
    Power Electronics and Drive Systems, 2009. PEDS 2009. International Conference on; 12/2009
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    ABSTRACT: In this paper, the advanced control methods to minimise torque ripple and to maximise power density of a brushless DC motor/generator system. A simple and straightforward torque pulsation control method with copper loss minimisation for BLDC machines is presented first. Then, an optimal power control to maximise power density and minimise machine size and weight for BLDC machines is explained for generation modes. Overall, the proposed approaches can improve the performance of a BLDC motor/generator system.
    International Journal of Power Electronics 01/2009; 1(4).
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    ABSTRACT: Motors and generators are widely used in the industry. These rotating machines are modelled and simulated on computer for studying their behaviour. The underlying assumption in existing models is operation in the linear magnetic region and absence of losses. Further each sub‐category of the rotating machinery like induction motor, synchronous motor, DC motor etc. are modelled independently in absence of a common thread running through them. This paper proposes a generalised symmetrical model of a rotating machine which has the feature of scalability and adaptability. The generalised model proposed here does not impose any linearity restriction for the operation in magnetic domain and also factors in the losses. Bond graph modelling technique is used to develop the model. The model is validated by applying the linearity and ideality constraints which show that the conventional 'abc' three phase induction motor model is a special case of the proposed generalised model.
    International Journal of Power Electronics 01/2009; 1(4).

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